I usually have more than one thing I'm working on at once -- I've been working on three different novels. When I get stuck on one, I hop back and forth. It's sort of freeing: I can say I'm abandoning this thing that I hate forever and I'm moving on to something that's good. I'll find that I'll go back to [the other project] in a day or a week and like it again. But that moment of wanting to trash something -- that Virginia Woolf moment when you have to be stopped from filling your pocket with stones -- comes pretty regularly for me. Switching is probably a good thing.